35s vs 37s

[Yeti-X]

So I just did a mileage test on my non sas BL with f-rated 37's and the lie -o-meter said 18.7 both ways on a highway trip one way was 115 miles so I was really happy with that then I filled up with gas and only took 5.46 gals at 115 miles so 20.9 mpg. Then I was saddened to find out that my fuel gauge did not update so now I have to take in my Bronco for its first warranty claim because it says it still has 3/4 tank

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[BlueBronco]

Has anyone regretted 37’s with the 2.3 manual?

Not for one single second.
BL 4-dr 2.3 man 37's Cooper SST Pros
Gas mileage is 14mpg on a good day but most my driving is around town.